The current bridge state is accessible from the drm_bridge structure,
but since it's fairly indirect it's not easy to figure out.
Provide a helper to retrieve it.
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Signed-off-by: Maxime Ripard <mripard@xxxxxxxxxx>
---
include/drm/drm_bridge.h | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 2b65466540306feb0694abdc7cd801369cb9c9f0..6fb1da7c195e99143a67a999d16fe361c1e3f4ab 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -955,10 +955,42 @@ static inline struct drm_bridge *of_drm_find_bridge(struct device_node *np)
{
return NULL;
}
#endif
+/**
+ * drm_bridge_get_current_state() - Get the current bridge state
+ * @bridge: bridge object
+ *
+ * This function must be called with the modeset lock held.
+ *
+ * RETURNS:
+ *
+ * The current bridge state, or NULL if there is none.
+ */
+static inline struct drm_bridge_state *
+drm_bridge_get_current_state(struct drm_bridge *bridge)
+{
+ if (!bridge)
+ return NULL;
+
+ /*
+ * Only atomic bridges will have bridge->base initialized by
+ * drm_atomic_private_obj_init(), so we need to make sure we're
+ * working with one before we try to use the lock.
+ */
+ if (!bridge->funcs || !bridge->funcs->atomic_reset)
+ return NULL;
+
+ drm_modeset_lock_assert_held(&bridge->base.lock);
+
+ if (!bridge->base.state)
+ return NULL;
+
+ return drm_priv_to_bridge_state(bridge->base.state);
+}
+
/**
* drm_bridge_get_next_bridge() - Get the next bridge in the chain
* @bridge: bridge object
*
* RETURNS:
--
2.48.1
